2zulu1

August 2, 2011, 09:31 PM

Hopefully this will turn out to be a fun kinda thread, nothing really scientific and we'll see how bullets (ammunition) perform against some big, tough, bleached out range (as in open range) cow bones.

I'm going to start out with Winchester 127gr +P+ ammunition, baseline is using 1 gallon, soft plastic water bags to capture the bullet;

http://i119.photobucket.com/albums/o144/aztrekker/At%20the%20range/9mm127PWinRanger1250fps1150grs0605004.jpg

Just as there are mathematical formulas to calibrate loose/tight ballistic gel to a properly calibrated constant, same principle can be used to calibrate water to ballistic gel. According to Duncan MacPherson, bullets penetrating pig gut, ballistic gel and water expand to the same general diameter. Again according to Duncan MacPherson, beginning on page 251 (of his WTI book) and subsequent pages, there are tables, graphs and descriptions equating bullet performance in water to ballistic gel numbers. So, if one knows impact velocity, bullet weight and expansion diameter; ballistic gel numbers can be calculated.

(***where Vcav equals the lower velocity limit of the cavitation regime, Mw equals the predicted mass of the tissue within the wound cavity and Xcm equals the predicted penetration in soft tissue/calibrated 10% ordnance gelatin) by 481

Winchester Ranger 9mm 127 gr. JHP (+P+) - no barrier

Vi = 1250 feet per second

Mr = 115 grains

Dr = 0.605 inch

Vcav = 404.644 feet per second

Mw = 37.113 grams (1.309 ounce)

Xcm = 28.696 centimeters (11.298 inches)

Large cow bone placed at a complex angle;

http://i1103.photobucket.com/albums/g474/aztrekker511/9mmWin127Pcowbonewater003.jpg

Now to learn how a lightweight RA9TA bullet will perform against such a barrier, plus the bone was placed at a complex (vertical/horizontal) angle;

http://i1103.photobucket.com/albums/g474/aztrekker511/9mmWin127Pcowbonewater008.jpg

Bullet retained more weight than it did during the baseline test;

Winchester Ranger 9mm 127 gr JHP +P+ (RA9TA) v. heavy bone

Vi = 1250 feet per second

Mr = 126.3 grains

Dr = 0.528 inch

Vcav = 417.458 feet per second

Mw = 40.593 grams (1.432 ounces)

Xcm = 38.668 centimeters (15.224 inches)

Same type experiment as above, this time shooting a Federal 165gr HST and 4 layers of denim;

http://i119.photobucket.com/albums/o144/aztrekker/At%20the%20range/40165HST06431653grs006.jpg

Federal .40S&W 165 gr. HST JHP (P40HST3) v. four layers of denim

Vi = 1130 feet per second

Mr = 165.3 grains

Dr = 0.643 inch (1.61x cal)

Vcav = 397.316 feet per second

Mw = 50.993 grams (1.799 ounce)

Xcm = 33.807 centimeters (13.310 inches)

Now for the bone test;

http://i1103.photobucket.com/albums/g474/aztrekker511/40165HST3cowbone_486002.jpg

Backside of bone, petals folded inward (riveted) as it penetrated a tough bone barrier;

http://i1103.photobucket.com/albums/g474/aztrekker511/40165HST3cowbone_486006.jpg

Federal .40 S&W 165 gr. HST JHP (P40HST3) v. heavy bone

Vi = 1130 feet per second

Mr = 165.3 grains

Dr = 0.486 inch (1.215x caliber)

Vcav = 427.969 feet per second

Mw = 49.736 grams (1.754 ounces)

Xcm = 53.654 centimeters (21.123 inches)

Unlike simulated bone that has multiple examples of JHP cavities plugging up with material when placed in front of ballistic gel, I have not witnessed this phenomenom using cow bones.

The following post will show examples of JHP expansion against bone after first penetrating 3" of water.

Bob

I'm going to start out with Winchester 127gr +P+ ammunition, baseline is using 1 gallon, soft plastic water bags to capture the bullet;

http://i119.photobucket.com/albums/o144/aztrekker/At%20the%20range/9mm127PWinRanger1250fps1150grs0605004.jpg

Just as there are mathematical formulas to calibrate loose/tight ballistic gel to a properly calibrated constant, same principle can be used to calibrate water to ballistic gel. According to Duncan MacPherson, bullets penetrating pig gut, ballistic gel and water expand to the same general diameter. Again according to Duncan MacPherson, beginning on page 251 (of his WTI book) and subsequent pages, there are tables, graphs and descriptions equating bullet performance in water to ballistic gel numbers. So, if one knows impact velocity, bullet weight and expansion diameter; ballistic gel numbers can be calculated.

(***where Vcav equals the lower velocity limit of the cavitation regime, Mw equals the predicted mass of the tissue within the wound cavity and Xcm equals the predicted penetration in soft tissue/calibrated 10% ordnance gelatin) by 481

Winchester Ranger 9mm 127 gr. JHP (+P+) - no barrier

Vi = 1250 feet per second

Mr = 115 grains

Dr = 0.605 inch

Vcav = 404.644 feet per second

Mw = 37.113 grams (1.309 ounce)

Xcm = 28.696 centimeters (11.298 inches)

Large cow bone placed at a complex angle;

http://i1103.photobucket.com/albums/g474/aztrekker511/9mmWin127Pcowbonewater003.jpg

Now to learn how a lightweight RA9TA bullet will perform against such a barrier, plus the bone was placed at a complex (vertical/horizontal) angle;

http://i1103.photobucket.com/albums/g474/aztrekker511/9mmWin127Pcowbonewater008.jpg

Bullet retained more weight than it did during the baseline test;

Winchester Ranger 9mm 127 gr JHP +P+ (RA9TA) v. heavy bone

Vi = 1250 feet per second

Mr = 126.3 grains

Dr = 0.528 inch

Vcav = 417.458 feet per second

Mw = 40.593 grams (1.432 ounces)

Xcm = 38.668 centimeters (15.224 inches)

Same type experiment as above, this time shooting a Federal 165gr HST and 4 layers of denim;

http://i119.photobucket.com/albums/o144/aztrekker/At%20the%20range/40165HST06431653grs006.jpg

Federal .40S&W 165 gr. HST JHP (P40HST3) v. four layers of denim

Vi = 1130 feet per second

Mr = 165.3 grains

Dr = 0.643 inch (1.61x cal)

Vcav = 397.316 feet per second

Mw = 50.993 grams (1.799 ounce)

Xcm = 33.807 centimeters (13.310 inches)

Now for the bone test;

http://i1103.photobucket.com/albums/g474/aztrekker511/40165HST3cowbone_486002.jpg

Backside of bone, petals folded inward (riveted) as it penetrated a tough bone barrier;

http://i1103.photobucket.com/albums/g474/aztrekker511/40165HST3cowbone_486006.jpg

Federal .40 S&W 165 gr. HST JHP (P40HST3) v. heavy bone

Vi = 1130 feet per second

Mr = 165.3 grains

Dr = 0.486 inch (1.215x caliber)

Vcav = 427.969 feet per second

Mw = 49.736 grams (1.754 ounces)

Xcm = 53.654 centimeters (21.123 inches)

Unlike simulated bone that has multiple examples of JHP cavities plugging up with material when placed in front of ballistic gel, I have not witnessed this phenomenom using cow bones.

The following post will show examples of JHP expansion against bone after first penetrating 3" of water.

Bob